4-5 mph depending on wind, tides etc..
8-15
50 mph
Depends on how it is geared.
70
25 or so I would guess. My tri cruiser with 90hp Honda goes 23.
25-40
A 3HP motor can reach speeds up to at least 30 mph depending on what you are using it for.
about 25-30 mph
25 HP is 25 HP, no matter how you slice it and dice it.
About 10 to 12 on plane
Put a 12 hp motor on it.
This all depends on the boat in which it goes. A 25 HP outboard motor, on a 14' aluminum runabout can cruise at 20-25 mph. Now, if you were to install hydrofoils (do a Google search) to the bow and transom area of the same boat, you could go upwards of 45 MPH +. Although not very common today, hydrofoils are currently used on Italian, and American navy battleships...crazy fast